Pressure cooker



L. L. LUDINGTON PRES SURE COOKER Filed May 23, 1955' INVENTOR Y Y Zazure/zeal Ludmgioz;

ATTORNEYS March 31, 1936.

Patented 1 ATES 2,035,901 raasspna cooxna Lawrence L. Ludington, Muneie,Ind., assignor to Bali Brothers Company, 'Muncie, Ind., a cor-,

poration of Indiana Application May '23, 1935, Serial No. 23,030

2 Claims.

, The object ofmy invention is to provide a pressure retainingstructure, comprising a container anda closure therefor, the closurebeing provided with readily operable retaining means 5 of such characteras to serve not only to clamp the closure into pressure retainingposition but also to force said closure from sticking association withits seat preliminary to removal.

, Theaccompanying drawing illustrates my invention.

Fig. 1 is an elevation in partial radial section, of an embodiment of myinvention; and

Fig. 2 is a plan of the spring washer.

. In the drawing, I0 indicates the container provided at its mouth withan annular seat It and also provided with a plurality ofcircumfer'entially spaced lugs l2.

The cover I3 is provided with an annular seat It adapted to mate withseat I I. Cover I3 is provided with a plurality of circumferentiallyspaced lugs or bosses l5, corresponding in number and spacing with lugsI 2, and each of these lugs is perforated at I6, conveniently on an axisinclined inwardly and upwardly toward the axis of container in. Thelower end of perforation I 6 isenlarged into a pocket ll. Mounted ineach perforation. I6 and pocket I! is a hook shank I 8 threaded at itsupper end as indicated at I9 and provided at its lower end with a hook20 adapted to straddle a lug l2.

Threaded upon threads I!) is'an operating handle or knob'22 andinterposed between this knob and the upper end of lug I5 is a springwasher 23. Interposedbetween hook 20 and boss l5, within pocket I1, is aspring 24.

The shank I8 is ensmalled, below threads 19, and the circular spring 23extends into the groove thus formed so that, when knob 22 is backed Aaway from engagement with the spring 23 said spring serves to retainhook 20 from too great displacement axially relative to its boss iithereby preventing the jaw of the hook from dropping below the plane oflugs l2 so that. by turning the cover the hooks may be readily shiftedintoand out of co-ordination with said lugs.

Pocket I] is so formed as to prevent substantial rotation of shank l8and book 20 without interfering with axial movement of said hook Y andthe springs24 are of suflicient strength to break any sticking contactbetween seats l4 and.

Lugs l2 being circumferentially spaced, and hooks 20 being carried bythe cover and being substantially non-rotative about their own axes,

it will be readily apparent that the cover may be seated when the coveris angularly positioned with its hooks 20 circumferentially offset fromlugs I 2, and may then be readily angularly shifted to bring the hooks20 into straddling positions over the lugs l2 whereupon by tighteningknobs 5 22 the hooks 20 may be brought into engagement with the undersides of lugs l2 and the cover seat l4 forced into engagement with thecontainer seat II. On the reverse, loosening of the knobs 22 permitssprings 24 to force the heels of 10 the hooks 20 into engagement withthe mouth of the receptacle and thus lift seat H from seat I I. Theknobs 22 may serve as handles by means of which the cover may betransported and manipulated. 7 15 I claim as my invention:

1. In a pressure cooker, the combination with a container having a.series of circumferentially separated outwardly projecting lugs, and anannular cover seat, of a cover adapted to seat upon 20 said seat andprovided with a series of perforated portions corresponding in numberand spacing with said lugs, a clamping hook having a shank projectedthrough and axially movable in each of said perforations and a jawadapted to 25 laterally receive one of said lugs and to engage the samein opposite directions axially of the hook shank, a compression springinterposed between each hook and the cover, an operating knob threadedupon the, shank of each hook and 30 abutting the cover in opposition tosaid spring, and means limiting axial movement of the hook relative tothe cover to retain its jaw in the plane of the container lugs when thecover is seated on said container.

2. In a pressure cooker, the combination with v a container having aseries of circumferentially separated outwardly projecting lugs, and anannular cover seat, of a cover adapted to seat upon said seat andprovided with a series of perforated 40 portions corresponding in numberand spacing with said lugs, a clamping hook having a shank projectedthrough and axially movable in each of said perforations and a jawadapted to laterally receive one of said lugs and to engage the 45 samein opposite directions axially of the hook shank, means to limitrotation of each hook, a compression spring interposed between each hookand the cover, an operating knob threaded upon the shank of each hookand abutting the cover 50 in opposition to said spring, and meanslimiting axial movement of the hook relative to the cover to retain itsjaw in the plane of the container lugs when the cover is seated on saidcontainer.

' LAWRENCE L. LUDINGTON.

